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20130416
20130424
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sinha 1
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technologies, often by a robot... or personally by a technician on a bicycle. sensors detect breaks, cracks, and weaknesses in the pipe. man: we have roots at this cap lateral at 79. narrator: tree roots can grow into the pipe, splitting it apart. man: more light roots at 69. narrator: sometimes they may even find fully collapsed sections. after gathering the data, utilities can assess the need for rehabilitation. sinha: you have to choose the rehabilitation technique so that the life of the pipe can be extended 30 years, 40 years, 50 years. allbee: any asset has an optimal investment strategy. if you're making investments in that asset too early, or too late, you're wasting money. it costs about three times as much to fix a system once it's failed. so it's all about finding that right point where the dollars should flow toward that asset. narrator: but finding the funds to evaluate and rebuild these assets is an ongoing struggle. johnson: there is a gap between what's being spent by municipalities and water supply systems and what needs to be spent. and somehow that has to be made up. so t
improve these systems, you need to deploy the latest technology. woman: the pipe bursting process is designed to replace an old pipe without digging an entire trench. the old pipe has cracks and displaced joints and openings in it. we try to stop, not only infiltration, but exfiltration, where sewage would actually leak out of the pipe. the head is larger, so it breaks away the old pipe and allows the new pipe to come in behind it. griffin: we are saving about 67% of the cost of actually digging old pipe up. clyne: it's less invasive than an open-cut process, where you would open the whole trench up and replace the pipe. it's called "trenchless" technology, so... that's as good as it gets. griffin: we don't have to dig up everyone's yard, and we refurbish that pipe at a much-reduced cost. another technique, the cured-in-place lining. it's equivalent to putting a large sock through the existing sewer. we form a new pipe inside the old pipe, and therefore we seal up all of the defects that allow rainwater to come in. hunter: we repair about 730 leaks a month in our system. griffin:
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